Insulator



p 1940- G, E HOSFIELD INSULATOR Filed April 17, 1939 2 Sheets-Sheet l I In venior git/7067? 1e /c p 1940 G. E. HOSFIELD 2,215,152

INSULATOR Filed April 17, .1939 2 Sheets-Sheet 2 Efi6wflek /l v MM lam,

A iiorneys Patented Sept. 17, 1940 UNITED STATES PATENT OFFICE IN SULATOR I Glenn E. Hosfleld, Lincoln, Nebr. Application April 17, 1939, Serial No. 268,392 1 Claim. (cl. 174-400) The present invention relates to new and useiul improvements in insulators particularly for telegraph, telephone, electric lines, etc., and has for its primary object to provide, in a. manner as hereinafter set forth, a device of this character embodying a resilient or yieldable mounting of a novel construction and arrangement whereby suillcient movement will be permitted in all directions to substantially reduce or eliminate breakage of the wire as a result of crystallization, shock and other causes.

Other objects of the invention are to provide a yieidable insulator of the aforementioned character which will be comparatively simple in construction, strong, durable, highly emcient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is an elevational viewof an insulator constructed in accordance with the present invention, showing the device mounted on a cross arm.

Figure 2 is a view. in vertical section through the insulator.

Figure 3 is a detail view in vertical section through the outer member or shell.

Figure 4 is a bottom plan view of the outer member or shell.

Figure 5 is a detail view in elevation of the resilient inner member or thimble.

Figure 6 is a bottom plan view of the resilient inner member or thimble.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises an outer member or shell I of suitable material, such as porcelain. The shell I is open at its lower end, said shell being of a substantially inverted cup shape. Formed integrally with the interior of the shell I is a plurality of vertically and circumferentially spaced segmental ribs or the like 2.

The reference numeral 3 designates an inner member or thimble which is engagea-ble in the shell I. The inner member or thimble 3 is of suitable resilient material, such as natural or artificial rubber.

As illustrated to advantage in Fig. 5 of the drawings, the thimble 3 has formed therein a plurality of vertically spaced circumferential grooves 4 for the reception of the ribs 2. The thimble 3 is further provided, in its periphery,

1 with a plurality of vertical grooves or channels 5 which intersect the circumferential grooves or channels 4. The thimble 3 has extending upwardly thereinto from its lower end a threaded socket 6 for the reception of the usual pin 1 (see Fig. l) for mounting the insulator on a cross arm 8.

It is thought that the manner in which the device functions will be readily apparent from a consideration of the foregoing. The line wire (not shown) is secured to the outer member or shell I in the usual manner. The inner member or thimble 3 on which the shell I is mounted, being of resilient material, suchas rubber, movement of said shell I in all directions will be permitted. Thus, crystallization and wire failure resulting therefrom is greatly reduced or substantially eliminated. This yieldable or resilient mounting of the shell I also substantially eliminates breakage of the line wire from other causes, such as shock, when it becomes coated with ice, etc. To assemble the insulator, the ribs 2 are aligned with the grooves or channels 5 and the thimble 3 is inserted in the shell I, said ribs 2 travelling or sliding in the grooves 5. When the thimble 3 has been substantially fully inserted the segmental ribs 2 will be aligned with the circumferential grooves or channels 4 in the thimble 3. Then, relative rotation between the members I and 3 brings the ribs 2 into the grooves 4 thus locking said members together. As best seen in Fig. 2 of the drawings, there is a clearance of about one sixty fourth of an inch between the members I and 3. Before being inserted in the member I, the thimble 3 should have applied thereto one or more coatings of Gilsonite asphalt to prevent it from sticking to the shell or the pin. It will be observed that the lowermost ribs 2 constitute flanges which are engaged beneath the lower end of the thimble 3.

It is believed that the many advantages of an insulator constructed in accordance with the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

An' insulator comprising an elongated thimble of live rubber having a threaded socket therein GLENN E. 

